The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_syncache.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1993, 1994, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
   30  * $FreeBSD: releng/11.1/sys/netinet/tcp_syncache.h 319654 2017-06-07 12:50:54Z tuexen $
   31  */
   32 
   33 #ifndef _NETINET_TCP_SYNCACHE_H_
   34 #define _NETINET_TCP_SYNCACHE_H_
   35 #ifdef _KERNEL
   36 
   37 void     syncache_init(void);
   38 #ifdef VIMAGE
   39 void    syncache_destroy(void);
   40 #endif
   41 void     syncache_unreach(struct in_conninfo *, tcp_seq);
   42 int      syncache_expand(struct in_conninfo *, struct tcpopt *,
   43              struct tcphdr *, struct socket **, struct mbuf *);
   44 int      syncache_add(struct in_conninfo *, struct tcpopt *,
   45              struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
   46              void *, void *);
   47 void     syncache_chkrst(struct in_conninfo *, struct tcphdr *);
   48 void     syncache_badack(struct in_conninfo *);
   49 int      syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
   50 
   51 struct syncache {
   52         TAILQ_ENTRY(syncache)   sc_hash;
   53         struct          in_conninfo sc_inc;     /* addresses */
   54         int             sc_rxttime;             /* retransmit time */
   55         u_int16_t       sc_rxmits;              /* retransmit counter */
   56         u_int32_t       sc_tsreflect;           /* timestamp to reflect */
   57         u_int32_t       sc_ts;                  /* our timestamp to send */
   58         u_int32_t       sc_tsoff;               /* ts offset w/ syncookies */
   59         u_int32_t       sc_flowlabel;           /* IPv6 flowlabel */
   60         tcp_seq         sc_irs;                 /* seq from peer */
   61         tcp_seq         sc_iss;                 /* our ISS */
   62         struct          mbuf *sc_ipopts;        /* source route */
   63         u_int16_t       sc_peer_mss;            /* peer's MSS */
   64         u_int16_t       sc_wnd;                 /* advertised window */
   65         u_int8_t        sc_ip_ttl;              /* IPv4 TTL */
   66         u_int8_t        sc_ip_tos;              /* IPv4 TOS */
   67         u_int8_t        sc_requested_s_scale:4,
   68                         sc_requested_r_scale:4;
   69         u_int16_t       sc_flags;
   70 #if defined(TCP_OFFLOAD) || !defined(TCP_OFFLOAD_DISABLE)
   71         struct toedev   *sc_tod;                /* entry added by this TOE */
   72         void            *sc_todctx;             /* TOE driver context */
   73 #endif
   74         struct label    *sc_label;              /* MAC label reference */
   75         struct ucred    *sc_cred;               /* cred cache for jail checks */
   76 #ifdef TCP_RFC7413
   77         void            *sc_tfo_cookie;         /* for TCP Fast Open response */
   78 #endif
   79         void            *sc_pspare;             /* TCP_SIGNATURE */
   80         u_int32_t       sc_spare[2];            /* UTO */
   81 };
   82 
   83 /*
   84  * Flags for the sc_flags field.
   85  */
   86 #define SCF_NOOPT       0x01                    /* no TCP options */
   87 #define SCF_WINSCALE    0x02                    /* negotiated window scaling */
   88 #define SCF_TIMESTAMP   0x04                    /* negotiated timestamps */
   89                                                 /* MSS is implicit */
   90 #define SCF_UNREACH     0x10                    /* icmp unreachable received */
   91 #define SCF_SIGNATURE   0x20                    /* send MD5 digests */
   92 #define SCF_SACK        0x80                    /* send SACK option */
   93 #define SCF_ECN         0x100                   /* send ECN setup packet */
   94 
   95 struct syncache_head {
   96         struct mtx      sch_mtx;
   97         TAILQ_HEAD(sch_head, syncache)  sch_bucket;
   98         struct callout  sch_timer;
   99         int             sch_nextc;
  100         u_int           sch_length;
  101         struct tcp_syncache *sch_sc;
  102         time_t          sch_last_overflow;
  103 };
  104 
  105 #define SYNCOOKIE_SECRET_SIZE   16
  106 #define SYNCOOKIE_LIFETIME      15              /* seconds */
  107 
  108 struct syncookie_secret {
  109         volatile u_int oddeven;
  110         uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
  111         struct callout reseed;
  112         u_int lifetime;
  113 };
  114 
  115 struct tcp_syncache {
  116         struct  syncache_head *hashbase;
  117         uma_zone_t zone;
  118         u_int   hashsize;
  119         u_int   hashmask;
  120         u_int   bucket_limit;
  121         u_int   cache_limit;
  122         u_int   rexmt_limit;
  123         uint32_t hash_secret;
  124         struct vnet *vnet;
  125         struct syncookie_secret secret;
  126 };
  127 
  128 /* Internal use for the syncookie functions. */
  129 union syncookie {
  130         uint8_t cookie;
  131         struct {
  132                 uint8_t odd_even:1,
  133                         sack_ok:1,
  134                         wscale_idx:3,
  135                         mss_idx:3;
  136         } flags;
  137 };
  138 
  139 #endif /* _KERNEL */
  140 #endif /* !_NETINET_TCP_SYNCACHE_H_ */

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